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frosja888 [35]
3 years ago
7

7х + 2y = -1 3х — 4y = 19

Mathematics
1 answer:
Deffense [45]3 years ago
3 0

Answer:

x = 1, y = -4

Step-by-step explanation:

7х + 2y = -1  ------ eq1

3х — 4y = 19 ------ eq2

multiply eq1 by 2

2 x (7х + 2y = -1)

14x + 4y = -2 -----eq3

by elimination, add equation 2 and 3

14x + 3x = 19-2

17x = 17  (divide both sides by 17)

x = 1  (answer)

substitute into eq1

7(1) + 2y = -1  (subtract 7 from both sides)

2y = -1 -7

2y = -8 (divide both sides by 2)

y = -8/2 = -4 (answer)

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2(3c + 3) < 6c + 9
Usimov [2.4K]
<h3>Answer: B. All real numbers</h3>

Work Shown:

2(3c+3) < 6c+9

6c+6 < 6c+9 .... distribute

6c+6-6c <6c+9-6c .... subtract 6c from both sides

6 < 9 ... note the c terms go away entirely

We're left with a statement that is always true since 6 is always less than 9 regardless of what value of c we pick. So there are infinitely many solutions. Any real number can replace c to get a true statement.

4 0
4 years ago
A shark weighs 405 kg and 68 grams a second shark weighs 324 kg and 75 g how much more does the first shark weigh in grams than
mariarad [96]

For this case we have to by definition:

1 kg equals 1000 grams

Shark 1:

405 kg and 68 grams

405 kg * \frac {1000 g} {1kg} = 405,000 grams

Thus, shark 1 weighs 405,068 grams.

Shark 2:

324 kg and 75 grams

324 kg * \frac {1000 g} {1 kg} = 324,000 grams

Thus, shark 2 weighs 324,075 grams.

Subtracting we have:

405.068 grams-324.075 grams = 80.993 grams

Thus, shark 1 weighs 80,993 grams more than the second.

Answer:

Shark 1 weighs 80,993 grams more than the second.

8 0
3 years ago
Help sleepyhelp asap
SVEN [57.7K]

Answer:

The one that has the number of meals in the side and the one that has number of days

Step-by-step explanation:

If it’s 3 meals a day u would want the one that says meals and days now if u look at the chart u can see that this one has 3 meals for one day which is the same as the equation she has

Hope this helps

8 0
3 years ago
3. 84,800.45 x 10 <br>4. 45.67 divided by 1,000​
Alexandra [31]

Answer:

3. 84,8004.5

4. 0.04567

8 0
3 years ago
Read 2 more answers
Please help ASAP.........
Pavlova-9 [17]
1)y=5-2/3
y=13/2

2) t=4 1/2+ 4 1/2
t=9
 3) w= 3 5/8+2 7/12
    w=29/8+31/12
     w=15/2
7 0
3 years ago
Read 2 more answers
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